Cook the potatoes with their skin on and then peel them.
Wash the zucchini and remove the stem and flower.
Now cut the potatoes and zucchini into approx. 1/2 cm thick slices and layer them like a roof tile in a flat baking dish.
Now salt and pepper the layered vegetables.
Put 0.5 cups of sour cream in a small bowl, add 2-3 tablespoons of water, peel and squeeze the garlic clove, stir everything and spread over the vegetables.
Finally, pour the grated cheese over it.
Cook in the preheated oven at 190 ° O / U for approx. 30 minutes. The cheese should look golden yellow.